This document provides information on FP Ultra Low Range Pressure Difference Switches. The switches have a user adjustable knob to set the switching point in pascals without needing a pressure gauge. They have an IP66 rated die cast aluminum housing and can withstand up to 10 million switching operations. The switches have operating ranges from 20 to 4000 pascals and can be used with air or non-aggressive gases at temperatures up to 80°C. Installation instructions are also provided.

1. FP ULTRA LOW RANGE PRESSURE DIFFERENCE SWITCHES
Ultra Low Range Pressure Difference Switches with User Adjustable Knob
Salient Features
Easy to See, Easy to Use!
Set Point easily user adjustable with
visible scale in Pascal. (no need of
pressure gauge)
Enclosure
Robust Gravity Die Cast Aluminum
Long Lasting!
10
6
switching operations
Trusted all over!
Tested and Proven
Technical Specifications
Media: Air, non-flammable gases and
non-aggressive gases
Housing Material: IP 66 Gravity Die
Cast Aluminium
Protection Category: IP66 with cover.
Ranges: 20 Pa to 4000 Pa
Maximum Working Pressure: 0.1 bar
Electrical Rating: Maximum 1.0A (.4 A)
/ 250VAC
Electrical Connection: Standard
Terminal Strip provided
Cable Entry: ½” NPT
High Pressure and
Low Pressure Port: 1/8” BSP(F)
Media Temperature: 80°C max.
Ambient Temperature: -5°C to 60°C
Range Selection Table
Range
Code
(Orion)
Adjustment Range for
Upper Switching Pressure
Pa (mm wg)
Switching Differential
Set to
Pa (mm wg)
FP80 20-200
(2.039-20.395)
10
(1.020)
FP81 40 - 100
(4.079 - 10.197)
20
(2.039)
FP82 40 - 200
(4.0479 - 20.395)
20
(2.039)
FP83 50 - 500
(5.099 - 50.987)
20
(2.039)
FP85 200 - 1000
(20.395 – 101.974)
100
(10.197)
FP86 500 – 2500
(50.987 – 254.935)
150
(15.296)
FP87 1000 – 4000
(101.974 – 407.896)
250
(25.494)
How to order FP series Low Range Pressure Difference Switches
Please specify the Range Code e.g.. FP82 or FP85 as per range selection table.

2. NK Instruments Pvt. Ltd.B-501/504, 5th floor, Raunak Arcade, Near THC Hospital, Gokhale Road, Naupada,
Thane(W) 400602. Maharashtra INDIA Telefax Nos.: 91-22-25301330 / 31 / 32
E-Mail: sales@nkinstruments.com Web: http://www.nkinstruments.com
Skype: nitinkelkarskype Gtalk: nkinstruments2006
Authorised Dealer
ULTRA LOW RANGE PRESSURE DIFFERENCE SWITCHES FP
INSTALLATION AND OPERATING INSTRUCTIONS
Principle of Operation
When the effective force generated by the pressure difference in the lower and upper chamber of the pressure
capsule exceeds/falls beyond the balancing spring forces, an electrical element is actuated.
Mounting
The detailed mounting dimensions are shown in Fig. 1.
1) Pressure Switches can be mounted on a plate/inside a panel using Ø7 mounting holes provided.
2) For any other process connection, please use an adaptor.
Fig. 1
INSTALLATION DRAWING
CABLE ENTRY
1/2" NPT(F)
110.0 145.0
(4.33) (5.71)
26.0 126.0
(1.02) (4.96)
Ø7, MOUNTING
HOLES, 2 NOS
P1
HIGH PRESSURE PORT
1/8" BSPF
P2
LOW PRESSURE PORT
1/8" BSPF
50.8 Sq.
(2.0)
APPROX. DIMENSIONS IN
inches
P1 = High Pressure Port
P2 = Low Pressure Port
Note : 1. Use two screws only, for mounting
2. Remove transport protection from P1 and P2
CAUTION :
Install pressure switch vertically. Installing it at an angle more than 30° to vertical may result in malfunction.
.
.
.
.